AT&T PARTNER II Release 3.1 Programming And Use Instructions page 72

To Program Fax 2 (Receive—Ext. Y)
If the fax machine has the Notify feature, set it to select intercom first. If the
1.
fax machine does not have the Notify feature and you want it to be able to
dial out when fax 1 is unavailable, set Automatic Line Selection for
extension Y to select outside lines first (line A selected last).
2. Set Line Ringing for line A at extension Y to immediate Ring; set all other lines
at extension Y to No Ring. (For all other extensions, set line A to No Ring or
Delayed Ring.)
3. Use Line Assignment (#301) to assign only line A to extension Y.
4. Set Automatic Extension Privacy (#304) for extension Y to Assigned.
Make sure extension Y is not assigned as a Pickup Group Extension (#501),
5.
Calling Group Extension (#502), Night Service Group Extension (#504),
or Hunt Group Extension (#505).
To monitor the fax machine at extension Y, use Fax Machine Extensions
6.
(#601) to identify extension Y as a fax extension and program a Fax
Management button by programming the fax machine extension number
on an Auto Dial button.
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Using Auxiliary Equipment